444xt Cummins First post, the good, bad, and ugly of a 444xt Cummins.

the 1980s where the best years for long living trucks if you looked after them ive had new and will keep my old ones pre 1993. electronics are nice but not when you need a wrecker for a new truck lol and a truck payment

 

I didn't mean the pressure from the tank, I meant the actual rail pressure the pump is supplying under load to the heads.

 

i know what you mean i did all that work to it before. im waiting for summit to send me an in dash gauge but i have a high psi gauge for the rail but need a quick connect fitting to plumb it in i didnt think i would have had any fuel issues updating the fuel lines to teflon so im pretty sure the water separator is almost plugged btw the fuel pump has never been touched still has a little red ball in the end of the shaft where the throttle hooks up it hasnt been drilled out

 

i took the truck out grossing 135,000.lbs after changing both filters on the fass pump and 22psi on the boost gauge this time was the highest i have seen it get . gauge for the fuel psi that will be next week .

 

installed gauge and have over 200 psi under load .also remved the ball and adjusted screw 3 turns counter clockwise and found boost increased quicker but only 22 psi . i removed the fuel button and it has a #10 so i put it back in and only 800 pyro on a long pull it still has paint on the turbo and manifold

 

if you have only 22psi boost with 200lbs of rail pressure id be looking for a boost leak or a damaged turbo. when is the last time you ran the overhead?

 

its never had anything done it only has 5000 miles on it . i hope the turbo is ok im not sure what i would replace it with . ive ran it a couple days with 3 turns out on the shaft screw then i went with a 4th turn now the boost gauge gets up to 25 psi and still 800 on the pyro .im not looking for smoke i would just like to peek it out a it

 

Retired now, but back in the late 80s I drove an International Eagle with a 444 in it. I worked for a flat land trucking company based in Manitoba Canada pulling Super B trailers grossing 140,000 lbs going over the prairies and Rocky Mountains. When I first got it the company spec'di it out to 365 hp to the rear tires. I was getting 4.5 miles to the gallon. It started to puff a little smoke and started losing power. I took it into Cummins and when I got it back they were grinning at me and told me I'd be happy with it. It took a little bit of arm twisting but they finally told me I was putting 725 horsepower to the back tires. I could pull away from any 3406 on the hills in the mountains (10 miles at 11% grade with some portions at 12%) and was getting 8 mpg on average across prairies and Rocky Mountains. No problems until the day I got out of that truck.